Aku & Kuro Kokoro

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__Introduction__ Aku & Kuro Kokoro are twins based off of the Story of Evil. They like to play pranks on the other Vocaloids, especially KAITO. ==Concept== Aku & Kuro are rather mischievous. They are based off of Riliane and Allen from the Story of Evil. ===Etymology=== Aku's name means 'Evil Heart' and is pronounced AA-KOO KOH-KOH-ROH. Kuro's name means 'Black Heart' and is pronounced KOO-ROH KOH-KOH-ROH. ===Appearance=== Aku and Kuro have black hair, red eyes, and pale skin. They wear black, red and gray versions of Rin and Len's outfits, except Aku has a tie instead of a bow on her shirt and wears a skirt. ===Relations=== Rin and Len, MORTAL ENEMIES KAITO, the guy they like to pick on; ZEITO, Aku's boyfriend